Metal spraying gun



Patented Feb. 12, 1952 METAL SPRAYING GUN:

Joel Abdon Albin Larsson, Uppsala, Sweden, as-

signor to Hjalmar Andren'dz'soner, Stockholm,

Sweden Application March 10, 1950, Serial No. 1 48,818 In Sweden March 14, 1949 This invention relates to an apparatus for spraying metals, such as tin, lead or the like in finely divided state onto surfaces, to be metallized.

Apparatus for this purpose are known, which however are subject to repeated interruptions in operation.

The purpose of the present invention is to obtain a metal spraying apparatus or metal spraying gun, in which the discrepancies of previously known apparatus are eliminated.

An embodiment of the invention is shown in the accompanying drawing.

Fig. 1 is a rear view of a metal spraying gun according to the invention.

Fig. 2 is a sectional side-view of the gun shown in Fig. 1.

The apparatus shown comprises a casing I, the lower part of which is shaped in form of a handle 2. The casing I encloses a horizontal air channel 3 opening at the rear of the casing. Said air channel communicates within the casing with a vertical air channel 4 leading to the upper part of the casing. The horizontal air channel 3 contains a spring actioned ball valve 5, which is operable by a bar 6 slidably guided in the forward part of the casing I. The vertical air channel 4 is at its upper end by means of a pipe connectins nut 1 connected to an air tube I l. The rear end of the horizontal air channel 3 is provided with connecting means 8 for an air supplying hose (not shown). The rear of the casing I is also provided with connecting means for an electric feed leader 9, leading to electric connecting means within the casing. The upper part of the metal spraying gun comprises a cylindrical metal container III, the forward end of which is formed into a valve casing I I. It will be noted also from the drawing that the longitudinal axis of container I occupies a horizontal position when case I is held in an upright position. The forward portion of the container I0 is surrounded by an electric heating element I2. At the upper side of the container there is a filling device IS. The air tube I4, connected to the upper end of the vertical air channel 4, is Wound around the heat 1 Claim. (ill. 118302) to the handle 2. The actioning means of the metal spraying gun comprise a trigger I8 pivotally mounted on a pin I9. The upper end of the trigger is pivotally connected to one end of a link 20, the other end of which is connected to an angle lever 2I. This angle lever is on the other side connected to an actuating bar 22, the upper end of which has a holder 23 for a valve needle 2 fixedly mounted thereon. The wall between the container Ill and the valve housing II is traversed by a channel 25. In order to prevent liquid metal to flow back from the valve housing into the container when the metal spraying gun is turned upwardly, saidchannel 25 runs obliquely upwards towards the valve casing.

The metal spraying gun described above works in the following manner:

The metal to be sprayed is filled into thecontainer II) and'is kept in liquid state in the container and the valve casing II by means of the heating element I2. The horizontal air channel 3 is by means of a hose connected to a source of compressed air. When pressing in the trigger I8, the valve needle 24 in the valve casing II is displaced upwards and opens the outlet of the valve casing. Simultaneously the bar 6 is displaced backwards and opens the ball valve 5, thus admitting compressed air into the vertical channel 4 and therefrom to the solenoid-shaped tube I4, where the compressed air is heated. The compressed air thus heated passes through the nozzle I5 and finely divides the metal flowing out through the opening at the lower end of the valve casing II. The heating of the air prevents the cooling of the outlet from the valve casing II and of the metal during the spraying.

What I claim is:

A metal spraying gun comprising in combination a casing having a lower handle portion by which to hold the same in an upright position, an air inlet channel within said casing, a valve in said channel controlling flow of air therethrough, a container for the metal disposed transversely atop said casing such that the longitudinal axis of said container occupies a horizontal position when said casing is held in an upright position, a

means establishing in the forward end wall of said container a smaller valve chamber the axis of which is disposed vertically when said casing is held in its upright position, said valve chamber being in heat conducting relation with said container and communicating with the latter by means of a channel extending obliquely downward from the valve chamber to the interior of the container, a downwardly directed nozzle at the lower end of said valve chamber for discharging molten metal, a valve needle displaceable longitudinally within said valve chamber for controlling discharge of molten metal through said nozzle, an, electricalheating element and a spiral air heater tube surrounding said" container, one end of said tube being connected to said air inlet channel and the other end terminating in a nozzle opening immediately below and at the side of the outlet of said nozzle for dischargeofrmolten. metal, a trigger pivotally mounted upon said casing, air valve actuating means; extending between said air valve and trigger, and a lever mechanism extending between said trigger and the upper end of said valve needle, said lever mfifihanism extending along the outside of said container and joining said valve needle outside of said valve; chamber whereby to efiect simultaneously discharge of molten metal from said valve chamber and heated air from said air tube upon actuation of said trigger.

JOEL ABDON ALBIN LARSSON.

REFERENCES CIIIEED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,190,153, Holmes Feb. 13, 1940 2, 01, 30. 2 Baasche June 4, 1946 2,434,911 Denyssen Jan. 27, 1948 FOREIGN PATENTS Number Country Date 247l3l9 Germany May 25, 1912 

